Investigation of single-mode fiber degradation by 405-nm continuous-wave laser light
Investigation of single-mode fiber degradation by 405-nm continuous-wave laser light
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DOI：
10.1117/1.oe.53.12.122512
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发表时间：
2014-12
影响因子：
1.3
通讯作者：
C. Gonschior;K. Klein;M. Menzel;T. Sun;K. Grattan
中科院分区：
文献类型：
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作者：
C. Gonschior;K. Klein;M. Menzel;T. Sun;K. Grattan
抽象的。详细研究了功率大于50 mW的405 nm光纤耦合半导体激光器系统的退化，重点关注输入端发生的影响。激光的耦合和传输损耗与入射表面上的突起和周期性结构的生长有关。为了避免这种退化，在输入端使用具有良好表面质量的短发射光纤。这样，电力传输至少稳定了一个月。然而，在单模光纤的输出表面上注意到结构退化。为了研究这种效应，在不同的时间段后测量受损样品，并用扫描电子显微镜和原子力显微镜进行检查。在核心区域发现了具有亚微米周期性结构的可再现球形投影。此外，光纤的光谱损耗进行了测量，示出了形成的深紫外线的色心沿光纤的长度沿着。这些调查伴随着输出表面上的结构的生长的模拟。结构的影响主要是对出射光束的发散角的影响，降低了光束质量。
Abstract. The degradation of 405-nm fiber-coupled diode laser systems with more than 50 mW power was investigated in detail with focus on the effects occurring at the input end. The coupling and transmission loss of the laser light were associated with the growth of a projection and a periodic structure on the input surface. To avoid this degradation, a short launch fiber with a good surface quality was used at the input end. In this way, the power transmission was stabilized for at least one month. However, structural degradation was noticed on the output surface of the single-mode fiber. To investigate this effect, the damaged samples were measured after different periods of time and examined with a scanning electron microscope and with an atomic force microscope. Reproducible spherical projections with a submicron periodic structure were found in the core region. Additionally, the spectral loss of the fiber was measured, showing the formation of color centers in the deep ultraviolet along the length of the fiber. These investigations were accompanied by simulations of the growth of the structure on the output surface. The influence of the structure was mainly on the divergence angle of the emitted laser beam, reducing the beam quality for applications.